®
MiniMax NT Heater
Digital Display Temperature Controller (DDTC)
Installation Instructions
IMPORTANT SAFETY INSTRUCTIONS
READ AND FOLLOW ALL INSTRUCTIONS
SAVE THESE INSTRUCTIONS
Table of Contents
SECTION I.
INSTALLATION ..............................................................................................................................2
WIRING ............................................................................................................................................2
INTRODUCTION OF DDTC...........................................................................................................7
SET UP .............................................................................................................................................8
LED INDICATORS ..........................................................................................................................8
TEMPERATURE SETTING ............................................................................................................9
SECTION II.
SECTION III.
SECTION IV.
SECTION V.
SECTION VI.
SECTION VII. HEATING MODE SELECTION ......................................................................................................9
SECTION VIII. REMOTE CONTROL .......................................................................................................................9
SECTION IX.
SECTION X.
TROUBLE SHOOTING..................................................................................................................10
MINIMAX NT HEATER DDTC RETROFIT KIT PARTS ..........................................................12
This instruction is to be used with the DDTC Retrofit Kit (P/N 472377) to replace the 6800 Temperature
Controller for all Pentair Pool Products NT Heaters.
DANGER
FOR YOUR SAFETY – READ BEFORE OPERATING
This product must be installed and serviced by a professional service technician qualified in pool/spa heater
installation and maintenance. If you do not follow these instructions exactly, a fire or explosion may result,
causing property damage, personal injury or loss of life.
WARNING
Before installing this product, read and follow all warning notices and instructions which are included. Failure
to follow safety warnings and instructions can result in severe injury, death, or property damage.
Call (800) 831-7133 for additional free copies of this manual.
Important Notice
Attention Installer.
This manual contains important information about the installation, operation and safe use of this
product. This information should be given to the owner/operator of this equipment.
Pentair Pool Products
1620HawkinsAve.,Sanford,NC27330•(919)774-4151
10951WestLosAngelesAve.,Moorpark,CA93021•(805)523-2400
Rev. B 1-20-04
1
P/N 472299
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Apply silicone between the gasket
and front-mounting frame.
Figure 2.
Apply silicone between the gasket
and rear-mounting frame.
Secure DDTC cover and rain
shield by using six screws.
Figure 3.
Rev. B 1-20-04
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B L K
W H T
Y E L
B L U
Figure 4.
P/N 472299
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B L K
W H T
Y E L
B L U
Figure 5.
Rev. B 1-20-04
5
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+
-
24
F1 F2
FC
VAC
IGN/ IGN/
240 120
L1
FS
PS TH VAL GND
THERMISTER
FAN
24VAC
SPA
COM
{
POOL
Figure 6.
P/N 472299
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REMOTE BUTTON
POOL BUTTON
POWER
REMOTE
POOL
SPA
PRESSURE SW
SYSTEM
INDICATOR
LIGHTS
THERMOSTAT
HEATING
SPA BUTTON
OFF BUTTON
OFF
TEMPERATURE SETTING
POOL
SPA
SERVICE
TEMP. UP
PRESS ANY ARROW ONCE TO
CHECK SET TEMPERATURE
SPA AND POOL
TEMPERATURE
SET BUTTONS
Figure 7.
TEMP. DOWN
SECTION III. INTRODUCTION OF DDTC
The DDTC board, shown in Figure 7, is a digital temperature controller capable of controlling the pool,
spa or both to a minimum temperature of 65° F. (below 65° F. display reads "Off") and a maximum of
104° F. The DDTC board also functions as a system status indicator, using LED lights and programmed
error codes.
During normal operation, the DDTC will display the current temperature of the water returning to the
heater, depending on which mode has been selected, “Pool” or “Spa”. This is accomplished by a
thermister (sensor) on the inlet port of the water header of the heater and working in conjunction with
theinternalmicroprocessorcontrollingtheoperationoftheheater.
Changing the desired pool or spa temperature is easily done by simply depressing the appropriate up or
down arrow until the display reads the desired set-point temperature. For example, set pool to 78° F.
and the spa to 104° F., when releasing the up or down arrow the display will flash once then return to
thecurrenttemperature.
At any time, you wish to know the temperature setting of the pool or spa, simply press the appropriate
up or down arrow, the display will flash once and display the set-point temperature for three (3) seconds,
then flash once again and return to the current temperature.
Rev. B 1-20-04
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SECTION IV. SET UP
The MiniMax NT Heater comes from the factory preset with a pool temperature setting of 78° F. and
a preset spa temperature of 100° F., and in the off mode setting. Once the power is turned on, the
DDTCboardwilldoaselfdiagnosticinternalcheck, duringthistimethedisplaywillfirstread“888”,
then the display will switch to three dashes “- - -“, this process takes approximately ten (10) seconds.
The DDTC will then illuminate the “Power” LED and “Off” LED, see Figure 8.
1. Turn on the power to the heater; the switch is on the bottom of the electrical junction box located
internallyontherightsideofthecabinet. TheDDTCwillnowgothroughtheself-diagnostic’stest
as stated above.
2. Turn on the circulating system pump and make sure that adequate water is being delivered
totheheater, The“PRESSURESW”LEDwillnowilluminate.
3. If you are using the heater with a remote control system, open the right door of the heater
to access the rear portion of the DDTC. Locate the three terminals marked “Pool” (J5),
“Spa” (J6) and “Com” (J8). If the remote system is a three-wire remote unit, connect the
pool lead to the “pool” terminal J5, connect the spa lead to the “spa” J6 terminal and connect
the common wire to the “com” terminal J8. If the remote system is a two-wire remote, the remote
system will be used to turn the heater on for a selected body of water, Pool or Spa, select which
application you are working with and connect one wire to the common terminal J8 and the other
wire to either “Pool J5” or “Spa J6”. Close and latch the door.
SECTION V. LED INDICATORS
There are nine lights that can be seen from the front of the control panel, (five are system indicators and
four are mode indicators), which helps you understand the operation of the heater, see Figure 7.
Ifsomethingshouldgowrong,thelightswillaidintroubleshootingtheproblem.Anadditionalfourlights
can be seen after opening the control panel. These four lights are diagnostic indicators for the service
techniciantotroubleshootthesystem.
On the right front of the DDTC board there are four Buttons and corresponding LED lights,
see Figure 7. Using the buttons allows you to select one of the four modes and the lights indicate which
operational mode that the heater is in, Off, Spa mode, Pool mode or Remote mode. If the heater is
not connected to a remote system then the remote mode will not be used.
Thefollowingaredescriptionsofthefivesystemindicators:
• POWER
The light is on at all times, in any switch position, indicating 24VAC power is being supplied to the
control circuit. If it fails to light, no other light will be on. Possible causes are:
1. External power to the heater is disconnected; check service panel circuit breaker or fuses;
2. Transformerhasfailed.
•PRESSURESW(WATERPRESSURESWITCH)
ThislightisonwhenSpa/PoolSelectorswitchison, indicatesthecirculatingpumpisrunningproperly.
If pressure light fails to light, the pump may have lost its prime or water flow may be restricted by an
inadvertently closed valve or clogged filter or pump basket. If you have determined that there is no
waterflowrestrictiontotheheater, youshouldcallaqualifiedtechnician.
P/N 472299
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•THERMOSTAT
Thislightisonwhenthethermostatcontactsclose, signaledbythewatertemperaturefallingbelowthe
set-point, calling for the heater to fire to maintain the desired water temperature.
•HEATING
Theheatinglightisonanytimethethermostathassignaledacallforheatwhichinitializestheignition
safetycircuit—thelightcomesonindicatingsuccessfulfiringofthemainburnersandstaysonuntilthe
pool/spareachthewatertemperaturesetting.
• SERVICE
The service light is off during normal operation of heater. The light only comes on if a problem with a
control has occurred or when the heater is first firing. The problem must be investigated by the technician
prior to attempts to fire the heater again.
SECTION VI. TEMPERATURE SETTING
The heater comes factory set at 78° F. for the pool mode and 100° F. for the spa mode, using the
up and down arrows, you can set the thermostats to a minimum temperature of 65° F., or a maximum
of 104° F. If you desire to heat only one body of water, the thermostat is capable of an off mode. As
an example, if you only wish to heat the spa and not the pool, simple depress and hold the pool down
arrow, and the thermostat will lower its setting to 65° F. then go to an off mode. If there is a remote
system connected to the heater, please see the special thermostat setting features under Heating Mode
Selection & Remote mode.
SECTION VII. HEATING MODE SELECTION
1. Off Mode: The heater will not come on. NOTE: The "Off" display on the Digital Display
Temperature Controller does not mean that the heater is off. It only states that the pool or spa
thermostathasbeenturnedoff.
2. Spa Mode: The heater will operate and heat the spa to the desired temperature.
3. Pool Mode: The heater will operate and heat the pool to the desired temperature.
4. Remote Mode: The DDTC is compatible with two and three wire remote control systems.
In order to operate by a remote control system, the REMOTE mode must be selected on the
front panel. When the REMOTE mode is selected, the REMOTE LED will light up.
SECTION VIII. REMOTE CONTROL
THE TWO-WIRE REMOTE CONTROL SYSTEM is typically installed and connected to the heater
for spa heating. The two-wire remote system is usually provided with a water temperature sensor that
monitors the system temperature and turns the heater on or off in response to the temperature of the spa.
To heat a spa, it should be connected to terminals J6 and J8. Pool heating remote control would
require connecting to terminals J5 and J8. If the REMOTE mode is set at the front panel LED light,
the DDTC will respond to a contact closure by remote system and heater will operate until the remote
systemtemperaturesettingissatisfied.
Rev. B 1-20-04
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NOTE: With this type of two-wire remote, with its own temperature sensors and system control,
using the up arrows on the front of the DDTC, hold down the up arrow until you reach the maximum
setting of 104° F., this allows the remote system thermostat to operate the heater at any set-point
below 104° F., the heater thermostats then act as a secondary controller if water temperature
reaches 104° F.
THE THREE-WIRE REMOTE CONTROL SYSTEM will be connected to terminals J5, J6 & J8.
J8 is the common terminal. If the heater is in the REMOTE mode, the DDTC will monitor the terminals
and respond to a contact closure between J5 & J8 or J6 & J8. A contact closure between J5 & J8 will
cause the DDTC to switch to the POOL setting and control the heater to the DDTC pool set-point
temperature. A contact closure between J6 & J8 will cause the DDTC to switch to the SPA setting and
control the heater to the DDTC spa set-point temperature. If only heating the spa, then depress the pool
down arrow until the display goes to “Off”.
SECTION IX. TROUBLE SHOOTING
The DDTC temperature display contains three LED’s with a decimal point between the first and second,
this display is also used to display an error code if for some reason there is a failure within the heater
control system or a DDTC internal fault. The DDTC will display the actual temperature or set-point
temperature or OFF, as selected by the user. When DDTC detects an error, the display will show Exx,
see Figure 8, where Exx is the error code of DDTC fault, see Table 1. Codes 1 through 9 indicate a
“soft lockout” error that means after these errors are fixed, the heater will resume normal operation and
restart immediately. Code ERR indicates a “hard lockout” error that means after these errors are fixed,
you need to reset the power of the heater through the switch on the bottom of the electrical junction box
on the right side of the cabinet.
NOTE: If Code ERR is shown on the LED display at any time, turn the heater off, (from power switch),
then turn on the heater again. If the error code is still displayed, call a certified Pentair Service Technician
forrepair.
Error Code
Error Description
E01
System Low Voltage
E02
High Temperature Limit
Thermal Fuse Open
E03
E04
Fan Failure
E05
Ignition / Flame Failure
E06
Gas Main Valve / Module Failure
Not Used
E07, E08, E09
ERR
Call Pentair's Technical Service Department at: (800) 831-7133
Table 1.
P/N 472299
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Rev. B 1-20-04
Figure 8.
Rev. B 1-20-04
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P/N 472299
SECTION X. MINIMAX NT HEATER DDTC RETROFIT KIT PARTS
P/N
Description
Qty.
072204
471870
472060
472100
472256
472257
472299
472379
472380
472381
472383
98212800
Wire Tie
2
2
1
1
1
1
1
1
1
1
1
6
Wire Assembly, Orange
Silicone Tube
DDTC Board
Gasket, DDTC Cover
Gasket, DDTC Mounting Plate
Instruction Sheet, DDTC Retrofit Kit
DDTC Cover w/Label
Barrier (Rain Shield)
¼ in. Female to Double Male, Piggyback
DDTC Mounting Plate w/Label
Screw, #6 X 5/8 in.
SAVE THESE INSTRUCTIONS.
Pentair Pool Products
1620HawkinsAve.,Sanford,NC27330•(919)774-4151
10951WestLosAngelesAve.,Moorpark,CA93021•(805)523-2400
P/N 472299
12
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Rev. B 1-20-04
|